cmd/namespace: Allow setting permissions on name that does not exist yet.
cmd/namespace: Allow setting permissions on name that does not exist
yet.

Change-Id: I1b76aaffd1bc8338e3b295967e9655b6d0959cab

vanadium/go.ref,vanadium/go.ref,vanadium/go.ref,vanadium/go.ref,vanadium/go.ref,vanadium/go.ref